We developed a wide-viewing-angle magnetophotonic crystal (MPC) for a magneto-optic three-dimensional (3D) display. The display controlled nano-sized magnetic pixel using thermomagnetic recording method. The MPC can reconstruct high brightness 3D images in localization wavelength. However, localization effect is reduced because of changing optical length in MPCs, when incidence angle is not perpendicular. Therefore, the MPC has angular dependence. In this study, we designed MPC to reduce angular dependence of diffraction efficiency by changing thickness of dielectric layers. As a theoretical result, we improved angular dependence of MPC that light intensity difference was less than 7.9% when viewing-angle was less than ±15°.